US11882062B2ActiveUtilityA1

Method and apparatus for wireless communications

93
Assignee: NXP USA INCPriority: Jun 16, 2020Filed: Jun 16, 2021Granted: Jan 23, 2024
Est. expiryJun 16, 2040(~13.9 yrs left)· nominal 20-yr term from priority
Inventors:Rui CaoHongyuan ZhangYan ZhangLiwen Chu
H04L 5/0007H04L 1/246H04L 5/0048H04W 76/15H04L 1/04H04L 1/08H04L 27/0006H04L 27/2614
93
PatentIndex Score
3
Cited by
38
References
22
Claims

Abstract

Embodiments of a method and an apparatus for wireless communications are disclosed. In an embodiment, a method for wireless communications involves encoding bits in a Physical Layer Protocol Data Unit (PPDU) using a basic bandwidth that is smaller than a signal bandwidth, wherein the bits are duplicated within the PPDU, and transmitting the PPDU with duplicated bits in accordance with a power spectrum density (PSD) limit.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. A method for wireless communications, the method comprising:
 encoding bits in a Physical Layer Protocol Data Unit (PPDU) using a basic bandwidth that is smaller than a signal bandwidth, wherein the bits are duplicated within the PPDU; and 
 transmitting the PPDU with the bits that are duplicated in accordance with a power spectrum density (PSD) limit, wherein an index in a modulation and coding scheme (MCS) field in the PPDU indicates the bits are duplicated, wherein the index identifies an MCS0-Dual Carrier Modulation (DCM) with 2 times Duplication (2×DUP) entry in an MCS table. 
 
     
     
       2. The method of  claim 1 , wherein the PPDU is a non-Orthogonal Frequency-Division Multiple Access (non-OFDMA) PPDU transmitted via a duplicated transmission. 
     
     
       3. The method of  claim 1 , wherein a duplicated PPDU format is used when the PPDU is at least one of a Media Access Control (MAC) control frame and a MAC management frame. 
     
     
       4. The method of  claim 3 , wherein the duplicated PPDU format is a non-High-Throughput (non-HT) duplicate (DUP) PPDU format, and wherein the basic bandwidth uses a non-HT PPDU format. 
     
     
       5. The method of  claim 3 , wherein the basic bandwidth of the duplicated PPDU format uses at least one of a duplicated High-Efficiency (HE) single-user (SU) PPDU and a duplicated HE extended range (ER) single user PPDU (ER-SU PPDU). 
     
     
       6. The method of  claim 1 , wherein bits encoded in a 20 MHz preamble portion of the PPDU include bandwidth information that indicates the signal bandwidth;
 wherein the bits encoded in the 20 MHz preamble portion of the PPDU are duplicated across the signal bandwidth; and 
 wherein a data portion of the PPDU uses a data rate lower than a data rate of binary phase shift keying (BPSK). 
 
     
     
       7. The method of  claim 6 , wherein the data portion of the PPDU is modulated using the basic bandwidth that is duplicated within at least one data segment of the signal bandwidth; and
 wherein at least one of a first per-subcarrier phase rotation is applied to the data portion of the PPDU based on an even tone in the data portion and a second per-subcarrier phase rotation is applied to the data portion of the PPDU based on an odd tone in the data portion. 
 
     
     
       8. The method of  claim 1 , wherein the basic bandwidth is at least one of 20 MHz, 40 MHz, 80 MHz, and 160 MHz. 
     
     
       9. The method of  claim 6 , wherein the data portion of the PPDU is modulated using the signal bandwidth and a data rate defined by binary phase shift keying dual carrier modulation and duplication (BPSK-Dual Carrier Modulation (DCM)+DUP). 
     
     
       10. The method of  claim 9 , wherein for a signal bandwidth of at most 160 MHz, bits included in the data portion of the PPDU are encoded and modulated using one fourth of data subcarriers included in the signal bandwidth; and
 wherein the bits modulated using one fourth of the data subcarriers are duplicated onto four subblocks of the signal bandwidth. 
 
     
     
       11. The method of  claim 9 , wherein for a signal bandwidth of at least 320 MHz, bits included in the data portion of the PPDU are parsed into two data segments and are encoded and modulated using one fourth of data subcarriers included in each segment; and
 wherein the bits modulated using one fourth of the data subcarriers are duplicated onto four segments of the signal bandwidth. 
 
     
     
       12. The method of  claim 9 , wherein at least one of a polarity change and the per-subcarrier phase rotation is applied to each duplication of the data subcarriers onto the four subblocks of a segment within the signal bandwidth. 
     
     
       13. The method of  claim 9 , wherein a per-subcarrier conjugate is applied to each duplication of the data subcarriers onto four segments of the signal bandwidth. 
     
     
       14. The method of  claim 6 , wherein:
 the data portion of the PPDU is modulated using at least one of a 40 MHz bandwidth and an 80 MHz bandwidth that is duplicated across the signal bandwidth; and 
 the data portion uses a data rate of at least one of a Quadrature Carrier Modulation (QCM), BPSK-DCM+DUP, and a one fourth coding rate. 
 
     
     
       15. The method of  claim 14 , wherein when the data portion uses the data rate of BPSK-DCM+DUP, the data portion is encoded via modulation coding scheme index 0 dual carrier modulation duplicated by two (MCS0+DCM+2× duplication). 
     
     
       16. The method of  claim 14 , wherein bits included in the data portion of the PPDU are encoded and modulated onto a segment using half of the signal bandwidth, and wherein the bits encoded and modulated onto the segment are duplicated onto another segment. 
     
     
       17. The method of  claim 14 , wherein bits included in the data portion of the PPDU are encoded onto a segment using half of the signal bandwidth;
 wherein the bits encoded onto the segment are duplicated onto other segments N times; and 
 wherein N is a maximum number of times a segment is duplicated. 
 
     
     
       18. The method of  claim 1 , wherein when the PPDU is transmitted in a frequency band of less than 6 GHz, there is no PSD limit for the transmission of the PPDU; and
 wherein frequency bands utilized in a less than 6 GHz range include at least one of Unlicensed National Information Infrastructure (U-NII)-1, U-NII-2A, U-NII-2B, U-NII-2C, U-NII-3, U-NII-4, or U-NII-5. 
 
     
     
       19. The method of  claim 1 , wherein when the PPDU is transmitted in a frequency band of 6 GHz, the PSD is limited to 5 dBm per 1 MHz for an Access Point (AP) and −1 dBm per 1 MHz for a non-AP station (STA); and
 wherein frequency bands utilized within a 6 GHz range include at least one of U-NII-5, U-NII-6, U-NII-7, or U-NII-8 U-NII-5, U-NII-6, U-NII-7, and U-NII-8. 
 
     
     
       20. A wireless device, the wireless device comprising:
 a processor configured to: 
 encode bits in a Physical Layer Protocol Data Unit (PPDU) using a basic bandwidth that is smaller than a signal bandwidth, wherein the bits are duplicated within the PPDU; and 
 transmit the PPDU with the bits that are duplicated in accordance with a power spectrum density (PSD) limit, wherein an index in a modulation and coding scheme (MCS) field in the PPDU indicates the bits are duplicated, wherein the index identifies an MCS0-Dual Carrier Modulation (DCM) with 2 times Duplication (2×DUP) entry in an MCS table. 
 
     
     
       21. The method of  claim 1 , wherein the MCS table includes separate entries for MCS0 to MCS13 modulation and MCS0-DCM in addition to the entry for MCS0-DCM with 2×DUP. 
     
     
       22. The wireless device of  claim 20 , wherein the MCS table includes separate entries for MCS0 to MCS13 modulation and MCS0-DCM in addition to the entry for MCS0-DCM with 2×DUP.

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